摘要
EPS处理软土地基具有的独特优越性已逐渐引起学界的重视。基于GDS空心圆柱扭剪试验和ABAQUS有限元数值模拟,进行了轨道交通荷载作用下EPS颗粒轻质混合土的动力特性研究。研究表明:EPS颗粒体积配比Ve/Vs、初始平均有效固结压力p0、初始固结应力比R0、初始中主应力系数b0和初始大主应力方向角α0这5个因素对最大动剪切模量和参考剪应变有明显的影响,但归一化的G/G0—γ/γr曲线基本不受以上试验变量影响;数值模拟结果显示,采用非线性动力本构模型计算得到的EPS混合土路堤中的应力比弹性本构的计算结果大,且剪应力随深度的增加衰减更快。该结论可为EPS颗粒轻质混合土在软土地区的应用提供参考和理论支持。
The superiority of the EPS composite soil in solving the problems of soft soil foundation has drawn the researchers′more and more attention.In this paper,a series of experiments and numerical simulations were carried out by an advanced hollow cylinder apparatus and the ABAQUS finite element software to study the dynamic characteristics of EPS composite soil under the traffic loading.The results indicated that the five variables including the volume ratio of EPS beads to the soil Ve/Vs,initial average effective consolidation pressure p0,initial consolidation stress ratio R0,initial intermediate principal stress coefficient b0,and initial principal stress direction angleα0had great effects on the maximum dynamic shear modulus and the the reference shear strain,while the curves of G/G0~γ/γrwere hardly affected by these factors.On the other hand,the finite element analysis results showed that the stress increased when EPS composite soil was considered as viscous elastic material instead of elastic material;what＇s more,the shear stress attenuated more rapidly with the depth.This paper is expected to shed some light on the further studies on EPS composite soil in soft soil area.
出处
《防灾减灾工程学报》
CSCD
北大核心
2015年第5期651-658,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(5110907)
中国博士后科学基金项目(2012M511260)
中国博士后科学基金特别资助项目(2013T60529)
江苏省博士后基金项目(1301124C)
河南省交通运输厅科技计划项目(2012PⅡ05)资助
